.nav li {float: left;width: 100px;height: 20px;margin: 2px;list-style:none;text-align: center;}
.mid p {text-align: center;}
#p2 {font-size: 24px;line-height: 15px;}
.header li {list-style: none;}
.header li a {text-decoration: none;color: white;font-weight: bold;font-size: 20px;}
.mid {margin-top: 300px;}
.help {margin: 90px 30px;}
.help #help_p1 {font-size: 24px;line-height: 34px;}
.help #help_p2 {font-size: 20px;line-height: 36px;}
.intro0 {margin-top: 100px;}
.intro0 .intro1 {width: 65%;display: inline-block;margin-left: 50px;}
.intro0 .intro1 p {font-size: 20px;}
.intro0 .intro2 {width: 25%;display: inline-block;margin: 50px 0;}
.intro_end p {font-size: 14px;text-align: center;}
.mid a {text-decoration: none;color: red;font-size: 56px;line-height: 15px;font-weight: bold;}
.header {top: 0;width: 100%;background-color: rgba(0,0,0,0.1);font-size: 1.5rem;line-height: 40px;color: #fff;left:0;font-weight: bold;margin-bottom: 20px;display: flex;}
.header>div:nth-of-type(1){width: 88%;}
.header>div:nth-of-type(2){width: 12%;}